# maths

cards for maths revision

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• Created by: alaya
• Created on: 10-04-12 10:39

## Exterior angles

Exterior angle= 360/n

Sum of exterior angles= 360

1 of 6

## Interior angles

Interior angle= 180- EXTERIOR ANGLE

Sum of interior angles= (n- 2)*180

2 of 6

## Area of triangle

AREA of a triangle= 1/2 * base * vertical height

A= 1/2 * b * h

3 of 6

## area of parallelogram

AREA of a parallelogram= base * vertical height

A= b * h

4 of 6

## area of trapezium

AREA of trapezium= average of parallel sided * distance between them

A= 1/2 * (a+b)* h

5 of 6

## area of a circle

A= pi * r squared

Circumference= C= pi * D

AREA of sector=  angle/ 360 * area of full circle

LENGTH of arc= angle/360 * circumference of full circle

6 of 6

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I thought the formula for circumference is 2pi * r . (first do pi times 2 then the radius) :S

Report

nope its pi* diameter

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that's the same cos 2 of the radiuses make up the diameter. cos the diameter is all the way across the circle and the radius is halfway across. :)

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